Michael Clarke Duncan, an Oscar nominee and a recent TV star of The Finder has died at the age of 54. Thanks to Twitter, reactions from Hollywood were swift and sad. A number of actors, producers and more who had worked with Duncan took to the social media site to express their grief.

According to a report from the Associated Press, Duncan died on the morning of Monday, September 3 at Cedars-Sinai Medical Center in Los Angeles. He had been hospitalized since a heart attack on July 13.

The actor is best-known for films like The Green Mile (for which Michael Clarke Duncan was nominated for an Academy Award), Armageddon and Kung Fu Panda. In recent years, Duncan expanded his work into television. He had a memorable role on the Chuck season 2 premiere and then co-starred in the 2012 Bones spinoff, The Finder, in which he played Leo Knox.

Many in Hollywood who had worked with Duncan posted messages following the announcement of the news.

Stephen Nathan, the executive producer of Bones, tweeted, "Michael Clarke Duncan RIP. You will be missed."

Director Robert Rodriguez posted, "Was fortunate to work with Michael Clarke Duncan on Sin City. A very kind and generous actor. He'll be greatly missed."

Two and a Half Men star Jon Cryer, shared a bit of an anecdote, "I 1st "met" Michael Clarke Duncan at a charity softball game. When I say "met" I mean he hit a line drive into my crotch. #shouldawornacup"

Zachary Levi, the former star of Chuck, wrote, "Blessed to have had the opportunity to work with Michael Clarke Duncan while he was still with us. He was a kind soul that will be missed."

Yvette Nicole Brown tweeted: ":( I worked with Michael on the film, #TheIsland. He was a cool dude. #RIP...Michael Clarke Duncan dead at 54."

Music author David Wild wrote, "#RIPMichaelClarkeDuncan whose American journey took him from ditch-digger to Oscar nominee. A big heart gone too soon."

Words from Michael Clarke Duncan himself are available on Twitter as well. Tweeting regularly as @OfficialMCD, there are plenty of messages. Some seem particularly poignant following the actor's early death.

Duncan's last activity on Twitter was a retweet of a message and photo from @MochaMom365, "@Omarosa is holding it down at the #AllstateTJFR" The actor did not send out any original Twitter messages after he was hospitalized in July.